/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.kubernetes;

import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.clusterframework.types.ResourceIDRetrievable;
import org.apache.flink.runtime.resourcemanager.exceptions.ResourceManagerException;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * A stored Kubernetes worker, which contains the kubernetes pod.
 */
public class KubernetesWorkerNode implements ResourceIDRetrievable {
	private final ResourceID resourceID;

	/**
	 * This pattern should be updated when {@link KubernetesResourceManager#TASK_MANAGER_POD_FORMAT} changed.
	 */
	private static final Pattern TASK_MANAGER_POD_PATTERN = Pattern.compile("\\S+-taskmanager-([\\d]+)-([\\d]+)");

	KubernetesWorkerNode(ResourceID resourceID) {
		this.resourceID = checkNotNull(resourceID);
	}

	@Override
	public ResourceID getResourceID() {
		return resourceID;
	}

	public long getAttempt() throws ResourceManagerException {
		Matcher matcher = TASK_MANAGER_POD_PATTERN.matcher(resourceID.toString());
		if (matcher.find()) {
			return Long.parseLong(matcher.group(1));
		} else {
			throw new ResourceManagerException("Error to parse KubernetesWorkerNode from " + resourceID + ".");
		}
	}
}
